From: Jamison Hope <jrh@theptrgroup.com>
To: "kawa@sourceware.org list" <kawa@sourceware.org>
Subject: strange int->boolean behavior
Date: Thu, 18 Dec 2014 18:19:00 -0000 [thread overview]
Message-ID: <72768B2F-733F-4F37-BB02-880E16C2E855@theptrgroup.com> (raw)
Sometimes, a primitive 0 is false:
#|kawa:1|# (->boolean (->int 3))
Exception in thread "main" java.lang.Error: unsupported CodeAttr.emitConvert
at gnu.bytecode.CodeAttr.emitConvert(CodeAttr.java:2006)
[...]
#|kawa:1|# (if (->int 3) "YES" "NO")
YES
#|kawa:2|# (if (->int 0) "YES" "NO")
YES
#|kawa:3|# (define (f x::int) ::string (if x "YES" "NO"))
#|kawa:4|# (f 3)
YES
#|kawa:5|# (f 0)
NO
#|kawa:6|# (disassemble f)
In class atInteractiveLevel$3
Method name:"f" public static Signature: (int)java.lang.CharSequence
Attribute "Code", length:70, max_stack:1, max_locals:1, code_length:14
0: iload_0
1: ifeq 10
4: getstatic <Field atInteractiveLevel$3.Lit0 java.lang.String>
7: goto 13
10: getstatic <Field atInteractiveLevel$3.Lit1 java.lang.String>
13: areturn
I get similar results with the other primitive types. If I'm following things correctly, it's ConditionalTarget#compileFromStack which is treating zero as false?
--
Jamison Hope
The PTR Group
www.theptrgroup.com
next reply other threads:[~2014-12-18 18:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-18 18:19 Jamison Hope [this message]
2015-02-19 23:06 ` Per Bothner
2015-02-20 0:39 ` Jamison Hope
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